If the sd domain just has one group, then we must be caught the
i == target later, and then goes to deeper level domain.
So just skip this domain checking to save some instructions.
Signed-off-by: Alex Shi <alex....@linaro.org>
---
kernel/sched/fair.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c7395d9..3265fbc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4196,6 +4196,11 @@ static int select_idle_sibling(struct task_struct *p,
int target)
sd = rcu_dereference(per_cpu(sd_llc, target));
for_each_lower_domain(sd) {
sg = sd->groups;
+
+ /* skip single group domain */
+ if (sg == sg->next)
+ continue;
+
do {
if (!cpumask_intersects(sched_group_cpus(sg),
tsk_cpus_allowed(p)))
--
1.8.1.2
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